A thermistor is an electrical component whose resistance changes.
Which of the following descriptions matches the correct circuit symbol for a thermistor?
A student uses a thermistor as a device for measuring temperature. The student records the resistance of the thermistor every 10 ∘C10\ ^\circ\text{C}10 ∘C as hot water in a beaker cools. The table below shows the results:
| Temperature ( ∘C\ ^\circ\text{C} ∘C) | Resistance (Ω\OmegaΩ) |
|---|---|
| 80 | 120 |
| 70 | 180 |
| 60 | 260 |
| 40 | 620 |
| 30 | 780 |
| 20 | 1020 |
State the independent and dependent variables in this investigation.
Explain which variable should be plotted on the horizontal (xxx) axis and which on the vertical (yyy) axis, including their units.
Describe whether a straight line of best fit or a curve of best fit is more appropriate for these data, and estimate the resistance of the thermistor when the temperature is 50 ∘C50\ ^\circ\text{C}50 ∘C.
Suggest three improvements that could be made to the experimental setup to increase accuracy or reliability.
The thermistor is taken out of the water and connected in a series circuit with a 9.00 V cell. At a certain ambient temperature, the resistance of the thermistor is 1020 Ω.
State the equation linking voltage, current, and resistance.
Calculate the current in the circuit.
Explain what will happen to the current in the circuit when the temperature of the thermistor increases.
